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19-4342; Rev 0; 10/08
1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier
General Description
The MAX9610 high-side current-sense amplifier offers precision accuracy specifications of V OS less than 500V (max) and gain error less than 0.5% (max). This device features an ultra-low 1A quiescent supply current. The MAX9610 fits in a tiny, 1mm x 1.5mm DFN package or a 5-pin SC70 package, making this part ideal for applications in notebook computers, cell phones, cameras, PDAs, and all lithium-ion batteryoperated portable devices where accuracy, low quiescent current, and small size are critical. The MAX9610 features an input voltage range (common mode) from 1.6V to 5.5V. This input range is excellent for monitoring the current of a single-cell, lithium-ion battery (Li+), which at full charge is 4.2V, typically 3.6V in normal use, and less than 2.9V when ready to be recharged. These current-sense amplifiers have a voltage output and are offered in three gain versions: 25V/V (MAX9610T), 50V/V (MAX9610F), and 100V/V (MAX9610H). The three gain versions offer flexibility in the choice of the external current-sense resistor. The very low 500V (max) input offset voltage allows small 25mV to 50mV full-scale VSENSE voltage for very low voltage drop at full-load current measurement. The MAX9610 is offered in tiny 6-pin DFN, (1mm x 1.5mm x 0.8mm footprint) and 5-pin SC70 packages, specified for operation over the -40C to +85C temperature range. For a very similar 1.6V to 28V input voltage device in a 4-bump UCSPTM package (1mm x 1mm x 0.6mm), refer to the MAX9938 data sheet.
Features
Ultra-Low Supply Current of 1A (max) Low 500V (max) Input Offset Voltage Low < 0.5% (max) Gain Error Input Common Mode: +1.6V to +5.5V Voltage Output Three Gain Versions Available 25V/V (MAX9610T) 50V/V (MAX9610F) 100V/V (MAX9610H) Tiny DFN (1mm x 1.5mm x 0.8mm) and SC70 Packages
MAX9610
Ordering Information
PART* MAX9610TELT+T MAX9610FELT+T MAX9610HELT+T MAX9610TEXK+T MAX9610FEXK+T MAX9610HEXK+T PINPACKAGE 6 DFN 6 DFN 6 DFN 5 SC70 5 SC70 5 SC70 GAIN (V/V) 25 50 100 25 50 100 TOP MARK OU OS OT ATG ATE ATF
*All devices are specified over the -40C to +85C extended temperature range. +Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Circuit
ILOAD RSENSE RS+ RSLOAD R1 VBATT = 1.6V to 5.5V VDD = 3.3V P C OUT R1
Applications
Cell Phones Cameras Portable Li+ Battery Powered Systems 3.3V and 5V Power Management Systems PDAs USB Ports
Pin Configurations appear at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc.
ROUT 10k GND
ADC
MAX9610
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610
ABSOLUTE MAXIMUM RATINGS
RS+, RS- to GND......................................................-0.3V to +6V OUT to GND .............................................................-0.3V to +6V RS+ to RS- .............................................................................6V Short-Circuit Duration: OUT to GND or RS+ ..............Continuous Continuous Input Current (Any Pin)..................................20mA Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ..............247mW 6-Pin DFN (derate 2.1mW/C above +70C) .............168mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Package Reflow Soldering Temperature .........................+260C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Current (Note 2) SYMBOL CONDITIONS VRS+ = 3.6V, TA = +25C ICC VRS+ = 3.6V, -40C < TA < +85C VRS+ = 5.5V, TA = +25C VRS+ = 5.5V, -40C < TA < +85C Common-Mode Input Range Common-Mode Rejection Ratio Input Offset Voltage VCM CMRR VOS Guaranteed by CMRR, -40C < TA < +85C 1.6V < VRS+ < 5.5V, -40C < TA < +85C TA = +25C, gain = 25, 50, 100 (Note 3) -40C < TA < +85C MAX9610T Gain G MAX9610F MAX9610H TA = +25C, gain = 25, 50, 100 (Note 4) Gain Error Output Resistance OUT Low Voltage OUT High Voltage GE ROUT VOL VOH -40C < TA < +85C TA = +25C (Note 5) G = 25 G = 50 G = 100 VOH = VRS- - VOUT (Note 6) Gain = 25, 50 Gain = 100 7.0 10 2.5 5 10 0.1 Gain = 25, 50 Gain = 100 25 50 100 0.1 0.5 0.8 1 13.2 15 30 70 0.2 V mV k % V/V 1.6 80 104 100 500 600 700 V 0.75 MIN TYP 0.6 MAX 1.0 1.4 1.2 1.6 5.5 V dB A UNITS
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Small-Signal Bandwidth Output Settling Time Power-Up Time SYMBOL BW tS tON CONDITIONS VSENSE = 50mV, G = 25 VSENSE = 50mV, G = 50 VSENSE = 50mV, G = 100 1% final value, VSENSE = 25mV 1% final value, VSENSE = 25mV MIN TYP 170 110 60 35 100 s s kHz MAX UNITS
MAX9610
Note 1: Note 2: Note 3: Note 4:
All devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. VOUT = 0V. ICC is the total current into RS+ plus RS-. VOS is extrapolated from measurements for the Gain Error test. Gain Error is calculated by applying two values of VSENSE and calculating the error of the slope, vs. the ideal: G = 25: VSENSE 20mV and 120mV G = 50: VSENSE 10mV and 60mV G = 100: VSENSE 5mV and 30mV Note 5: The device is stable for any external capacitance value. Note 6: VOH is the voltage from VRS- to VOUT with VSENSE = 3.6V/Gain.
Typical Operating Characteristics
(VRS+ = VRS- = 3.6V, TA = +25C.)
MAX9610F OFFSET VOLTAGE HISTOGRAM
MAX9610 toc01
MAX9610F GAIN ACCURACY HISTOGRAM
MAX9610 toc02
SUPPLY CURRENT vs. TEMPERATURE
900 800 SUPPLY CURRENT (nA) 700 600 500 400 300 200 100 1.6V 3.6V 5.5V
MAX9610 toc03
20
30 25 20
1000
15
N (%)
10
N (%)
15 10
5 5 0 -250 -200-150-100 -50 0 50 100 150 200 250 OFFSET VOLTAGE (V) 0 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 GAIN ACCURACY (%)
0 -40 -15 10 35 60 85 TEMPERATURE (C)
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610
Typical Operating Characteristics (continued)
(VRS+ = VRS- = 3.6V, TA = +25C.)
SUPPLY CURRENT vs. COMMON-MODE VOLTAGE
MAX9610 toc04
OFFSET VOLTAGE vs. TEMPERATURE
MAX9610 toc05
OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE
MAX9610 toc06
1.00 0.90 0.80 SUPPLY CURRENT (A) 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0 1.6 2.1 2.6 3.1 3.6 4.1 4.6
100 90 80 OFFSET VOLTAGE (V) 70 60 50 40 30 20 10 0
60 50 OFFSET VOLTAGE (V) 40 30 20 10 0
5.5
-40
-15
10
35
60
85
1.6
2.1
2.6
3.1
3.6
4.1
4.6
5.1 5.5
COMMON-MODE VOLTAGE (V)
TEMPERATURE (C)
COMMON-MODE VOLTAGE (V)
GAIN ERROR vs. TEMPERATURE
MAX9610 toc07
GAIN ERROR vs. COMMON-MODE VOLTAGE
MAX9610 toc08
VOUT vs. VSENSE VRS+ = 5.5V
MAX9610 toc09
0.25% 0.23% 0.21% GAIN ERROR (%) 0.19% 0.17% 0.15% 0.13% 0.11% 0.09% 0.07% 0.05% -40 -15 10 35 60
0% -0.02% -0.04% GAIN ERROR (%) -0.06%
6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 G = 25 G = 50 G = 100 VOUT (V)
-0.08% -0.10% -0.12% -0.14% -0.16% -0.18% -0.20%
85
1.6
2.1
2.6
3.1
3.6
4.1
4.6
5.1 5.5
0
50
100
150
200
250
TEMPERATURE (C)
COMMON-MODE VOLTAGE (V)
VSENSE (mV)
VOUT vs. VSENSE VRS+ = 1.6V
MAX9610 toc10
NORMALIZED GAIN vs. FREQUENCY
MAX9610 toc11
CMRR vs. FREQUENCY
MAX9610 toc12
1.8 1.6 1.4 1.2 VOUT (V) 1.0 0.8 0.6 0.4 G = 100 G = 50 G = 25
5 0 NORMALIZED GAIN (dB) G = 100 G = 50 -10 -15 -20 G = 25 -5
-20 -40 -60 CMRR (dB) -80 -100 -120 -140
0.2 0 0 10 20 30 40 50 60 70 80 VSENSE (mV) -25 0.1 1 10 FREQUENCY (kHz) 100 1000 10 100 1k FREQUENCY (Hz) 10k 100k
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier
Typical Operating Characteristics (continued)
(VRS+ = VRS- = 3.6V, TA = +25C.)
SMALL-SIGNAL RESPONSE G = 25
MAX9610 toc13
MAX9610
SMALL-SIGNAL RESPONSE G = 50
MAX9610 toc14
VSENSE
20mV/div
VSENSE
10mV/div
VOUT
200mV/div
VOUT
200mV/div
10s/div
10s/div
SMALL-SIGNAL RESPONSE G = 100
MAX9610 toc15
LARGE-SIGNAL RESPONSE G = 25
MAX9610 toc16
VSENSE
5mV/div
VSENSE
100mV/div
VOUT
200mV/div
VOUT
1V/div
10s/div
10s/div
LARGE-SIGNAL RESPONSE G = 50
MAX9610 toc17
LARGE-SIGNAL RESPONSE G = 100
MAX9610 toc18
VSENSE
50mV/div
VSENSE
20mV/div
VOUT
1V/div
VOUT
1V/div
10s/div
10s/div
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610
Pin Description
PIN DFN 1 2, 5 3 4 6 SC70 1, 2 -- 3 4 5 NAME GND N.C. OUT RSRS+ Ground No Connection. Not internally connected. Output Load-Side Connection to External Sense Resistor Power-Side Connection to External Sense Resistor FUNCTION
OUT Swing vs. VRS+ and VSENSE The MAX9610 is unique since the supply voltage is the input common-mode voltage (the average voltage at RS+ and RS-). There is no separate VCC supply voltage input. Therefore, the OUT voltage swing is limited by the minimum voltage at RS+. VOUT(MAX) = VRS+(MAX) - VSENSE(MAX) - VOH and
RSENSE = VOUT G x I LOAD (max)
Detailed Description
The MAX9610 family of unidirectional high-side, current-sense amplifiers features a 1.6V to 5.5V input common-mode range. The input range is excellent for monitoring the current of a single-cell lithium-ion battery (Li+), which at full charge is 4.2V, typically 3.6V in normal use, and less than 2.9V when ready to be recharged. The MAX9610 is ideal for many batterypowered, handheld devices because it uses only 1A quiescent supply current to extend battery life. The MAX9610 monitors current through a current-sense resistor and amplifies the voltage across that resistor. See the Typical Operating Circuit on page 1. The MAX9610 is a unidirectional current-sense amplifier that has a well-established history. An op amp is used to force the current through an internal gain resistor at RS+ that has a value of R1, such that its voltage drop equals the voltage drop across an external sense resistor, RSENSE. There is an internal resistor at RS- with the same value as R1 to minimize offset voltage. The current through R1 is sourced by a pFET. Its drain current is the same as its source current that flows through a second gain resistor, ROUT. This produces an output voltage, VOUT, whose magnitude is ILOAD x RSENSE x ROUT/R1. The gain accuracy is based on the matching of the two gain resistors R1 and ROUT (see Table 1). Total gain = 25V/V for the MAX9610T, 50V/V for the MAX9610F, and 100V/V for the MAX9610H.
VSENSE full scale should be less than VOUT/gain at the minimum RS+ voltage. For best performance with a 3.6V supply voltage, select RSENSE to provide approximately 120mV (gain of 25V/V), 60mV (gain of 50V/V), or 30mV (gain of 100V/V) of sense voltage for the fullscale current in each application. These can be increased by use of a higher minimum input voltage.
Accuracy In the linear region (VOUT < VOUT(MAX)), there are two components to accuracy: input offset voltage (VOS) and Gain Error (GE). The MAX9610 has VOS = 500V (max) and Gain Error of 0.5% (max). Use the following linear equation to calculate total error. VOUT = (Gain GE) x VSENSE (Gain x VOS) A high RSENSE value allows lower currents to be measured more accurately because offsets are less significant when the sense voltage is larger. Efficiency and Power Dissipation At high current levels, the I2R loss in RSENSE can be significant. Take this into consideration when choosing the resistor value and its power dissipation (wattage) rating. Also, the sense resistor's value might drift if it is allowed to heat up excessively. The precision VOS of the MAX9610 allows the use of small sense resistors to reduce power dissipation and reduce hot spots.
Applications Information
Choosing the Sense Resistor
Choose RSENSE based on the following criteria.
Table 1. MAX9610, Internal Gain Setting Resistors (Typical Values)
GAIN (V/V) 100 50 25 R1 () 100 200 400 ROUT () 10k 10k 10k
Voltage Loss A high RSENSE value causes the power-source voltage to drop due to IR loss. For minimal voltage loss, use the lowest RSENSE value.
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier
Kelvin Connections Because of the high currents that flow through RSENSE, take care to eliminate parasitic trace resistance from causing errors in the sense voltage. Either use a four terminal current-sense resistor or use Kelvin (force and sense) PCB layout techniques.
Typical Application Circuit
Bidirectional Application
Battery-powered systems may require a precise bidirectional current-sense amplifier to accurately monitor the battery's charge and discharge currents. Measurements of the two separate outputs with respect to GND yield an accurate measure of the charge and discharge currents, respectively (Figure 1).
MAX9610
Optional Output Filter Capacitor
When designing a system that uses a sample and hold stage in the analog-to-digital converter, the sampling capacitor momentarily loads OUT and causes a drop in the output voltage. If sampling time is very short (less than a microsecond), consider using a ceramic capacitor across OUT and GND to hold VOUT constant during sampling. This also decreases the small-signal bandwidth of the current-sense amplifier and reduces noise at OUT.
ILOAD
RSENSE TO WALL-CUBE/ CHARGER RS+ RSRS+ RSLOAD R1 R1 R1 R1
VBATT = 1.6V TO 5.5V P P
VDD = 3.3V
MICROCONTROLLER OUT OUT
ROUT
MAX9610
ROUT
MAX9610
ADC
GND
GND ADC
Figure 1. Bidirectional Application
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610
Pin Configurations
PROCESS: BiCMOS
TOP VIEW (PINS ON BOTTOM)
RS+ 6 N.C. 5 RS4
Chip Information
MAX9610T/F/H
+ 1 GND 2 N.C. 3 OUT
1mm x 1.5mm DFN TOP VIEW
RS+ 5 RS4
MAX9610T/F/H
+ 1 GND 2 GND 3 OUT
2mm x 2.2mm SC70 (DIAGRAMS NOT TO SCALE.)
8
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1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 6 DFN 5 SC70 PACKAGE CODE L611+1 X5+1 DOCUMENT NO. 21-0147 21-0076
MAX9610
TOPMARK 2 4 5
3
A
4
e
5
b
6 PIN 1 0.075x45
AA
PIN 1 MARK
1
E
L
A2 D TOP VIEW A1 SIDE VIEW
3
2 A A
1
L1
L2
BOTTOM VIEW
COMMON DIMENSIONS
b
A A1 A2 D E L L1 L2 b e Pkg. Code
SECTION A-A
MIN. 0.65 -0.00 1.45 0.95 0.30 0.00 0.05 0.17
NOM. 0.72 0.20 -1.50 1.00 0.35 --0.20 0.50 BSC.
MAX. 0.80 -0.05 1.55 1.05 0.40 0.08 0.10 0.23
L611-1, L611-2
TITLE:
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
APPROVAL DOCUMENT CONTROL NO. REV.
-DRAWING NOT TO SCALE-
21-0147
E
1
2
_______________________________________________________________________________________
6L UDFN.EPS
9
1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
TABLE 1
Translation Table for Calendar Year Code Calendar Year 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
Legend:
Marked with bar
Blank space - no bar required
TABLE 2
Translation Table for Payweek Binary Coding Payweek 06-11 12-17 18-23 24-29 30-35 36-41 42-47 48-51 52-05
Legend:
Marked with bar
Blank space - no bar required
TITLE:
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
APPROVAL DOCUMENT CONTROL NO. REV.
-DRAWING NOT TO SCALE-
21-0147
E
2
2
10
______________________________________________________________________________________
1A, DFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
SC70, 5L.EPS
MAX9610
PACKAGE OUTLINE, 5L SC70
21-0076
E
1
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
(c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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